Flat World Knowledge offers textbooks for free online for educational or personal use. They also offer convenient, low-cost textbook choices for students in different formats including print, audio, by-the-chapter, and...

Learners and educators in search of free textbooks may find a solution in LibreTexts, a nonprofit project that describes itself as "a multi-institutional collaborative venture to develop the next generation of...

Educators and learners interested in free digital textbooks, either to supplement or to replace traditional textbooks, may want to check out OpenStax. This nonprofit initiative at Rice University "publish[es]...